A wind chill factor of 1 to 3 means that proper clothing will
likely protect you from frostbite.

A wind chill factor of 4 means
that exposed skin may freeze depending on how active you are while you are
outside.

A wind chill factor of 5 or 6 means that exposed skin can
freeze very quickly. Face, hands, and feet should all be
protected.

A wind chill factor of 7 means extreme cold conditions
with a high chance of cold exposure injury.

High altitudes.

At higher altitudes, the air is "thinner" so you need to breathe more air to get the same amount of oxygen. Because the air is also drier, you may lose more body heat through the lungs by panting and being too active. Lower oxygen levels can also
change your normal good judgment, such as knowing when to wear adequate
protective clothing.

At higher altitudes, you don't shiver as much.
Shivering makes the body warm.

At higher altitudes, cold
temperatures and storms are often more intense. Shelter may be harder to find
or not provide enough protection.

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